Mobile station apparatus, mobile communication system and communication method

ABSTRACT

In a mobile communication system in which an space of a physical downlink control channel for a mobile station apparatus to search is defined based on a mobile station identity assigned from a base station apparatus, the base station apparatus places a physical downlink control channel including a first mobile station identity or a physical downlink control channel including a second mobile station identity in a search space of a physical downlink control channel corresponding to the first mobile station identity when the base station apparatus assigns a plurality of mobile station identities to the mobile station apparatus, and when a plurality of mobile station identities is assigned from the base station apparatus, the mobile station apparatus performs decoding processing of the physical downlink control channel including the first mobile station identity and the physical downlink control channel including the second mobile station identity in the search space of the physical downlink control channel corresponding to the first mobile station identity.

This application is a Divisional of co-pending application Ser. No.12/739,182, filed on Apr. 22, 2010. Application Ser. No. 12/739,182 isthe U.S. National Stage Application of PCT Application No.PCT/JP2009/057520, filed on Apr. 14, 2009, which claims the benefit ofpriority to Application No. 2008-113788, filed in Japan on Apr. 24,2008. The entire contents of all of the above applications areincorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a mobile station apparatus, mobilecommunication system, communication method and decoding processing of aphysical downlink control channel.

BACKGROUND ART

3GPP (3^(rd) Generation Partnership Project) is a project for discussingand preparing specifications of cellular telephone systems based onnetworks of evolved W-CDMA (Wideband-Code Division Multiple Access) andGSM (Global System for Mobile Communications). In 3GPP, the W-CDMAsystem has been standardized as the 3rd-generation cellular mobilecommunication system, and its service is started sequentially. Further,HSDPA (High-Speed Downlink Packet Access) with further increasedcommunication rates has also been standardized, and its service isstarted. 3GPP is discussing evolution of the 3rd-generation radio accesstechnique (Evolved Universal Terrestrial Radio Access: hereinafter,referred to as “EUTRA”).

As a downlink communication system in EUTRA, proposed is an OFDMA(Orthogonal Frequency Division Multiple Access) system for multiplexingusers using mutually orthogonal subcarriers. Further, in the OFDMAsystem are applied techniques such as an adaptivemodulation/demodulation-error correcting scheme (AMCS: AdaptiveModulation and Coding Scheme) based on adaptive radio link control (LinkAdaptation) such as channel coding, etc. AMCS is a scheme for switchingbetween radio transmission parameters (hereinafter, referred to as an“AMC mode”) such as an error correcting scheme, coding rate of errorcorrection, the level of data modulation, etc. corresponding to channelquality of each mobile station apparatus so as to efficiently performhigh-speed packet data transmission. The channel quality of each mobilestation apparatus is sent back to the base station apparatus using CQI(channel Quality indicator) as feedback.

In OFDMA, it is possible to divide the communicable region into thefrequency domain physically corresponding to subcarriers and timedomain. A combination of some divided regions is referred to as aresource block, one or more resource blocks are allocated to each mobilestation apparatus, and communications are performed while multiplexing aplurality of mobile station apparatuses. In order that the base stationapparatus and each mobile station apparatus perform communications withoptimal quality and rate in response to the request, required isphysical resource block allocation and transmission scheme determinationwith consideration given to the channel quality of a frequency bandassociated with each subcarrier in each mobile station apparatus. Sincethe base station apparatus determines the transmission scheme andscheduling, to achieve the request, each mobile station apparatus givesfeedback of channel quality for each frequency region to the basestation apparatus. Further, when necessary, each mobile stationapparatus transmits information indicative of a frequency region (forexample, with good channel quality) selected by the mobile stationapparatus to the base station apparatus as feedback.

Further, in EUTRA, to increase communication path capacity, it has beenproposed to use transmission diversity such as SDM (Space DivisionMultiplexing), SFBC (Space-Frequency Block Diversity) and CDD (CycleDelay Diversity) using MIMO (Multiple Input Multiple Output). MIMO is ageneric name for Multiple Input Multiple Output systems or techniques,and is characterized in that a plurality of branches is used in inputand output of radio signals to transmit, using a plurality of antennason the transmission and reception sides. A unit of a signal sequence isreferred to as a stream that can be transmitted in space multiplexingusing the MIMO scheme. The number (Rank) of streams in MIMOcommunications is determined by the base station apparatus inconsideration of channel state. The number (Rank) of streams requestedby the mobile station apparatus is sent to the base station apparatusfrom the mobile station apparatus as feedback using RI (Rank Indicator).

Meanwhile, in using SDM on downlink, in order to accurately divideinformation of a plurality of streams transmitted from respectiveantennas, it is under review to perform preprocessing on a transmissionsignal sequence in advance (which is referred to as “precoding”). Theinformation of precoding can be calculated based on channel stateestimated by a mobile station apparatus, and the mobile stationapparatus gives feedback to the base station apparatus using PMI(Precoding Matrix Indicator).

Thus, in order to achieve communications of optimal quality, each mobilestation apparatus is required to transmit various kinds of informationindicative of channel state to the base station apparatus as feedback.This channel feedback report CFR (channel state information) is formedof CQI, PMI, RI, etc. The number of bits and format of these channelfeedback reports are designated from the base station apparatus tomobile station apparatuses corresponding to circumstances.

FIG. 15 is a diagram illustrating a channel structure in EUTRA (seeNon-patent Document 1). The downlink of EUTRA is comprised of a physicalbroadcast channel (PBCH), physical downlink control channel (PDCCH),physical downlink shared channel (PDSCH), physical multicast channel(PMCH), physical control format indicator channel (PCFICH), and physicalHybrid ARQ indicator channel (PHICH).

Meanwhile, the uplink of EUTRA is comprised of a physical uplink sharedchannel (PUSCH), physical random access channel (PRACH), and physicaluplink control channel (PUCCH).

In EUTRA, due to the nature of uplink single carrier, the mobile stationapparatus cannot transmit signals concurrently using different channels(for example, PUSCH and PUCCH). When the mobile station apparatustransmits these channels at the same timing, the mobile stationapparatus multiplexes the information using the definition ofspecifications, etc. to transmit on the determined channel, or transmitsonly either one of information according to the definition ofspecifications, etc. (does not transmit (drops) the other data).

Meanwhile, the PUSCH is mainly used to transmit uplink data, and thechannel feedback report CFR is also transmitted using the PUSCH togetherwith uplink data (UL-SCH) when the report is not transmitted using thePUCCH. In other words, the channel feedback report CFR is transmitted tothe base station apparatus using the PUSCH or PUCCH. Generally, within asubframe, the PUSCH is assigned greater resources allocated to transmitthe channel feedback report CFR than in the PUCCH, and enablestransmission of more detailed channel feedback report CFR (when thenumber of physical resource blocks supported by the base stationapparatus and mobile station apparatus is 65 to 110 (system bandwidth of20 MHz), information of about 20 to 100 bits or more.) The mobilestation apparatus can transmit information of only about 15 bits or lessin a subframe using the PUCCH.

The mobile station apparatus is able to transmit the channel feedbackreport CFR periodically using the PUCCH. Further, the mobile stationapparatus is able to transmit the channel feedback report CFRperiodically or aperiodically using the PUSCH (Non-patent Documents 1and 2). The base station apparatus sets persistent or permanentresources and transmission interval of the PUSCH on a mobile stationapparatus using RRC signaling (Radio Resource control signal), andenables the mobile station apparatus to transmit the channel feedbackreport CFR periodically using the PUSCH. Further, by including a singlebit of information for instructions for channel feedback report request(channel state report trigger) in an uplink transmission grant signal,the base station apparatus enables the mobile station apparatus totransmit the channel feedback report CFR and uplink data aperiodically(temporarily, in one shot) using the PUSCH.

Further, the mobile station apparatus is able to transmit only thechannel feedback report CFR aperiodically using the PUSCH. Transmissionof only the channel feedback report CFR is that the mobile stationapparatus transmits only the channel feedback report CFR to the basestation apparatus (where information of ACK/NACK, etc. is included),instead of concurrently transmitting the uplink data and channelfeedback report CFR.

Meanwhile, in EUTRA, persistent or permanent PUSCH resources arescheduled for real-time traffic such as voice communications, and themobile station apparatus is capable of transmitting the PUSCH for uplinkdata without an uplink transmission grant signal by PDCCH. This iscalled persistent scheduling. The base station apparatus setstransmission intervals on the mobile station apparatus using RRCsignaling (Radio Resource Control signal), and activates persistentPUSCH allocation using a specific PDCCH. This specific PDCCH includesinformation for specifying a persistent PUSCH resource block, modulationand coding scheme, etc.

PRIOR ART DOCUMENT Non-patent Document

Non-patent Document 1: 3GPP TS (Technical Specification) 36.300, V8.4.0(2008-03), Technical Specification Group Radio Access Network, EvolvedUniversal Terrestrial Radio Access (E-UTRA) and Evolved UniversalTerrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2(Release 8)

Non-patent Document 2: 3GPP TS (Technical Specification) 36.213, V8.2.0(2008-03), Technical Specification Group Radio Access Network, physicalLayer Procedures (Release 8)

DISCLOSURE OF INVENTION Problems to be Solved by the Invention

However, in the conventional technique, there coexist PUSCH persistentscheduling for uplink data and PUSCH persistent allocation for theperiodic channel feedback report CFR. Further, for signals required forthese instructions, since different signals are used despite the signalshaving a commonality, there is a problem that the system design becomescomplicated.

Further, since different signals are used for a method of startingperiodic channel feedback and aperiodic channel feedback, and a methodof starting transmission of only channel feedback and concurrenttransmission of channel feedback and uplink data, there is a problemthat it is not possible to efficiently switch therebetween. Meanwhile,when an uplink transmission grant signal in different format is newlyintroduced, another problem occurs that unnecessary processing (blinddecoding processing) increases in mobile station apparatuses.

The present invention was made in view of such circumstances, and it isan object of the invention to provide a mobile station apparatus, mobilecommunication system and communication method for enabling a basestation apparatus to request a channel feedback report and/or persistentscheduling to a mobile station apparatus using an efficient signal.

Means for Solving the Problem

(1) To attain the above-mentioned object, the invention took measures asdescribed below. In other words, a mobile station apparatus of theinvention is a mobile station apparatus for which an space of a physicaldownlink control channel to search is defined based on a mobile stationidentity assigned from a base station apparatus, and is characterized byperforming decoding processing of a physical downlink control channelincluding a first mobile station identity and a physical downlinkcontrol channel including a second mobile station identity in a searchspace of a physical downlink control channel corresponding to the firstmobile station identity when a plurality of mobile station identities isassigned from the base station apparatus.

(2) Further, the mobile station apparatus of the invention ischaracterized in that the first mobile station identity is C-RNTI, andthat the second mobile station identity is C-RNTI for persistentscheduling.

(3) Moreover, a mobile communication system of the invention is a mobilecommunication system in which an space of a physical downlink controlchannel for a mobile station apparatus to search is defined based on amobile station identity assigned from a base station apparatus, and ischaracterized in that when the base station apparatus assigns aplurality of mobile station identities to the mobile station apparatus,the base station apparatus places a physical downlink control channelincluding a first mobile station identity or a physical downlink controlchannel including a second mobile station identity in a search space ofa physical downlink control channel corresponding to the first mobilestation identity, and that when a plurality of mobile station identitiesis assigned from the base station apparatus, the mobile stationapparatus performs decoding processing of the physical downlink controlchannel including the first mobile station identity and the physicaldownlink control channel including the second mobile station identity inthe search space of the physical downlink control channel correspondingto the first mobile station identity.

(4) Further, the mobile communication system of the invention ischaracterized in that the first mobile station identity is C-RNTI, andthat the second mobile station identity is C-RNTI for persistentscheduling.

(5) Moreover, a mobile station apparatus of the invention is a mobilestation apparatus for communicating with a base station apparatus, andis characterized by activating persistent resource allocation when aphysical downlink control channel includes a particular mobile stationidentity, while deactivating the persistently allocated resources whenthe physical downlink control channel includes the particular mobilestation identity, and resource allocation information is a beforehanddetermined value.

(6) Further, a mobile station apparatus of the invention is a mobilestation apparatus for communicating with a base station apparatus, andis characterized by transmitting uplink data and a channel feedbackreport to the base station apparatus with persistently allocated uplinkresources when a physical downlink control channel to allocatepersistent resources includes a request for the channel feedback report,while transmitting uplink data to the base station apparatus withpersistently allocated uplink resources when the physical downlinkcontrol channel does not include a request for the channel feedbackreport.

(7) Moreover, a communication method of the invention is a communicationmethod in a mobile station apparatus for which an space of a physicaldownlink control channel to search is defined based on a mobile stationidentity assigned from a base station apparatus, and is characterized inthat the mobile station apparatus performs decoding processing of aphysical downlink control channel including a first mobile stationidentity and a physical downlink control channel including a secondmobile station identity in a search space of a physical downlink controlchannel corresponding to the first mobile station identity when aplurality of mobile station identities is assigned from the base stationapparatus.

(8) Further, the communication method of the invention is characterizedin that the first mobile station identity is C-RNTI, and that the secondmobile station identity is C-RNTI for persistent scheduling.

(9) Moreover, a communication method of the invention is a communicationmethod in a mobile station apparatus for communicating with a basestation apparatus, and is characterized that the mobile stationapparatus activates persistent resource allocation when a physicaldownlink control channel includes a particular mobile station identity,while deactivating the persistently allocated resources when thephysical downlink control channel includes the particular mobile stationidentity, and resource allocation information is a beforehand determinedvalue.

(10) Further, a communication method of the invention is a communicationmethod in a mobile station apparatus for communicating with a basestation apparatus, and is characterized in that the mobile stationapparatus transmits uplink data and a channel feedback report to thebase station apparatus with persistently allocated uplink resources whena physical downlink control channel to allocate persistent resourcesincludes a request for the channel feedback report, while transmittinguplink data to the base station apparatus with persistently allocateduplink resources when the physical downlink control channel does notinclude a request for the channel feedback report.

Advantageous Effect of the Invention

According to the invention, a mobile station apparatus selects eitherone of persistently allocated uplink resources and temporarily allocateduplink resources as uplink resources to transmit a channel feedbackreport based on information included in a downlink control signal, andis thereby capable of efficiently switching between persistently andtemporarily allocated uplink resources. As a result, the mobile stationapparatus is able to transmit a channel feedback report to the basestation apparatus using an efficient signal. Further, it is possible tosimplify the system design.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a structure of channels in EUTRA;

FIG. 2 is a diagram illustrating another structure of channels in EUTRA;

FIG. 3 is a diagram illustrating a downlink frame structure in EUTRA;

FIG. 4 is a diagram illustrating an uplink frame structure in EUTRA;

FIG. 5 is a block diagram illustrating a schematic structure of a basestation apparatus according to Embodiments;

FIG. 6 is a block diagram illustrating a schematic structure of a mobilestation apparatus according to the Embodiments;

FIG. 7 is a diagram showing an example of operations of the mobilestation apparatus corresponding to types of physical downlink controlsignals (PDCCH);

FIG. 8 is a diagram showing another example of operations of the mobilestation apparatus corresponding to types of physical downlink controlsignals (PDCCH);

FIG. 9 is a diagram showing still another example of operations of themobile station apparatus corresponding to types of physical downlinkcontrol signals (PDCCH);

FIG. 10 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to dynamic physical downlink control signals (PDCCH) shownin FIG. 7;

FIG. 11 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to the case where a channel feedback report dedicatedrequest is designated by a persistent (or periodic channel feedback)physical downlink control signal (PDCCH) shown in FIG. 7;

FIG. 12 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to the case where a channel feedback report request isdesignated by a persistent (or periodic channel feedback) physicaldownlink control signal (PDCCH) shown in FIG. 7;

FIG. 13 is a diagram showing another example of transmission/receptionof signals between the mobile station apparatus and base stationapparatus corresponding to the case where a channel feedback reportrequest is designated by a persistent (or periodic channel feedback)physical downlink control signal (PDCCH) shown in FIG. 7;

FIG. 14 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to the case where a channel feedback report dedicatedrequest is designated by a persistent (or periodic channel feedback)physical downlink control signal (PDCCH) shown in FIG. 7; and

FIG. 15 is a diagram illustrating a channel structure in EUTRA.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments according to the invention will be described below withreference to drawings.

[Channel Structure]

FIGS. 1 and 2 are diagrams illustrating a channel structure in EUTRA. Asshown in FIGS. 1 and 2, these channels are classified into logicalchannels, transport channels and physical channels. FIG. 1 showsdownlink channels, and FIG. 2 shows uplink channels. The logicalchannels are to define types of data transmission service transmittedand received in a Medium Access control (MAC) layer. The transportchannels are to define what characteristics data transmitted in a radiointerface has and how the data is transmitted. The physical channels arephysical channels to convey the transport channels.

Among the logical channels are included a broadcast control channel(BCCH), paging control channel (PCCH), common control channel (CCCH),dedicated control channel (DCCH), dedicated traffic channel (DTCH),multicast control channel (MCCH), and multicast traffic channel (MTCH).

Among the transport channels are included a broadcast channel (BCH),paging channel (PCH), downlink shared channel (DL-SCH), multicastchannel (MCH), uplink shared channel (UL-SCH), and random access channel(RACH).

Among the physical channels are included a physical broadcast channel(PBCH), physical downlink control channel (PDCCH), physical downlinkshared channel (PDSCH), physical multicast channel (PMCH), physicaluplink shared channel (PUSCH), physical random access channel (PRACH),physical uplink control channel (PUCCH), physical control formatindicator channel (PCFICH), and physical Hybrid ARQ Indicator channel(PHICH). FIG. 15 shows the channels being transmitted and received.

The logical channels will be described below. The broadcast controlchannel (BCCH) is a downlink channel used to broadcast system controlinformation. The paging control channel (PCCH) is a downlink channelused to transmit paging information, and is used when the network doesnot know the location cell of the mobile station apparatus. The commoncontrol channel (CCCH) is a channel used to transmit control informationbetween mobile station apparatuses and network, and is used by mobilestation apparatuses having no radio resource control (RRC) connectionwith the network.

The dedicated control channel (DCCH) is a point-to-point bi-directionalchannel and is a channel used to transmit dedicated control informationbetween a mobile station apparatus and the network. The dedicatedcontrol channel (DCCH) is used by mobile station apparatuses having anRRC connection. The dedicated traffic channel (DTCH) is a point-to-pointbi-directional channel, dedicated to one mobile station apparatus, andused to transfer user information (unicast data).

The multicast control channel (MCCH) is a downlink channel used totransmit MBMS control information from the network to mobile stationapparatuses in a point-to-multipoint manner. This is used for MultimediaBroadcast Multicast Service (hereinafter referred to as “MBMS service”)for offering point-to-multipoint service. Methods of transmitting MBMSservice include Single-Cell Point-to-Multipoint (SCPTM) transmission andMultimedia Broadcast multicast service Single Frequency Network (MBSFN)transmission. The MBSFN transmission is simultaneous transmissiontechnique implemented by a plurality of cells simultaneouslytransmitting an identifiable waveform (signal). Meanwhile, the SCPTMtransmission is a method where one base station apparatus transmits MBMSservice.

The multicast control channel (MCCH) is a downlink channel used totransmit MBMS control information from the network to mobile stationapparatuses in a point-to-multipoint manner. Further, the multicastcontrol channel (MCCH) is used for one or several multicast trafficchannels (MTCHs). The multicast traffic channel (MTCH) is a downlinkchannel used to transmit traffic data (MBMS transmission data) from thenetwork to mobile station apparatuses in a point-to-multipoint manner.In addition, the multicast control channel (MCCH) and multicast trafficchannel (MTCH) are only used by mobile station apparatuses that receiveMBMS.

The transport channels will be described below. The broadcast channel(BCH) needs to be broadcast to the entire cell in fixed and pre-definedtransmission format. The downlink shared channel (DL-SCH) supports HARQ,dynamic adaptive radio link control, discontinuous reception (DRX) andMBMS transmission, and needs to be broadcast to the enter cell. Further,the downlink shared channel (DL-SCH) enables beam forming to be used,and supports dynamic resource allocation and semi-static resourceallocation. The paging channel (PCH) supports DRX and needs to bebroadcast to the entire cell. Further, the paging channel is mapped tophysical resources which are used dynamically for the traffic channeland other control channels, i.e. physical downlink shared channel(PDSCH).

The multicast channel (MCH) needs to be broadcast to the entire cell.Further, the multicast channel (MCH) supports MBSFN (MBMS SingleFrequency Network) combining of MBMS transmission from a plurality ofcells, and semi-static resource allocation such as a time frame using along cyclic prefix (CP). The uplink shared channel (UL-SCH) supportsHARQ and dynamic adaptive radio link control. Further, the uplink sharedchannel (UL-SCH) enables beam forming to be used, and supports dynamicresource allocation and semi-static resource allocation. The randomaccess channel (RACH) is to transmit limited control information, andhas the risk of collisions.

The physical channels will be described next. The physical broadcastchannel (PBCH) is to map the broadcast channel (BCH) at 40 ms intervals.The 40 ms timing is blindly detected (blind detection) (in other words,explicit signaling is not performed to indicate the timing.) Eachsubframe including the physical broadcast channel (PBCH) can be decoded(self-decodable) from the subframe, and is not divided into severaltimes to transmit.

The physical downlink control channel (PDCCH) is used to inform themobile station apparatus about resource allocation of the downlinkshared channel (PDSCH), hybrid automatic repeat request (HARQ)information for downlink data, and uplink transmission grant (uplinkgrant) that is resource allocation of the physical uplink shared channel(PUSCH).

The physical downlink shared channel (PDSCH) is a channel use totransmit downlink data or paging information. The physical multicastchannel (PMCH) is a channel used to transmit the multicast channel(MCH), and additionally assigned a downlink reference signal, uplinkreference signal and physical downlink synchronization signal.

The physical uplink shared channel (PUSCH) is a channel mainly used totransmit uplink data (UL-SCH). When the base station apparatus performsscheduling on the mobile station apparatus, the PUSCH is also used totransmit a channel feedback report (CQI, PMI, RI), and HARQacknowledgement (ACK)/negative acknowledgement (NACK) in response todownlink transmission.

The physical random access channel (PRACH) is a channel used to transmita random access preamble, and has a guard time. The physical uplinkcontrol channel (PUCCH) is a channel used to transmit the channelfeedback report (CFR), scheduling request (SR), HARQ acknowledge(ACK)/negative acknowledgement (NACK) in response to downlinktransmission, etc.

The physical control format indicator channel (PCFICH) is a channel usedto inform the mobile station apparatus of the number of OFDM symbolsused for the physical downlink control channel (PDCCH), and transmittedin each subframe. The physical Hybrid ARQ indicator channel (PHICH) isused to transmit HARQ ACK/NACK in response to uplink transmission.

[Channel Mapping]

As shown in FIG. 1, in the downlink, mapping is performed on thetransport channels and physical channels as described below. Thebroadcast channel (BCH) is mapped on the physical broadcast channel(PBCH). The multicast channel (MCH) is mapped on the physical multicastchannel (PMCH). The paging channel (PCH) and downlink shared channel(DL-SCH) is mapped on the physical downlink shared channel (PDSCH). Thephysical downlink control channel (PDCCH), physical hybrid ARQ indicatorchannel (PHICH) and physical control format indicator channel (PCHICH)are used alone as a physical channel.

Meanwhile, in the uplink, mapping is performed on the transport channelsand physical channels as described below. The uplink shared channel(UL-SCH) is mapped on the physical uplink shared channel (PUSCH). Therandom access channel (RACH) is mapped on the physical random accesschannel (PRACH). The physical uplink control channel (PUCCH) is usedalone as a physical channel.

Further, in the downlink, mapping is performed on the logical channelsand transport channels as described below. The paging control channel(PCCH) is mapped on the downlink shared channel (DL-SCH). The broadcastcontrol channel (BCCH) is mapped on the broadcast channel (BCH) anddownlink shared channel (DL-SCH). The common control channel (CCCH),dedicated control channel (DCCH) and dedicated traffic channel (DTCH)are mapped on the downlink shared channel (DL-SCH). The multicastcontrol channel (MCCH) is mapped on the downlink shared channel (DL-SCH)and multicast channel (MCH). The multicast traffic channel (MTCH) ismapped on the downlink shared channel (DL-SCH) and multicast channel(MCH).

In addition, mapping of the multicast control channel (MCCH) andmulticast traffic channel (MTCH) to the multicast channel (MCH) isperformed in MBSFN transmission, while this mapping is performed on thedownlink shared channel (DL-SCH) in SCPTM transmission.

Meanwhile, in the uplink, mapping is performed on the logical channelsand transport channels as described below. The common control channel(CCCH), dedicated control channel (DCCH) and dedicated traffic channel(DTCH) are mapped on the uplink shared channel (UL-SCH). The randomaccess channel (RACH) and logical channels are not mapped.

[Radio Frame Structure]

A frame structure in EUTRA will be described below. FIG. 3 illustrates adownlink frame structure, and FIG. 4 shows an uplink frame structure. Aradio frame identified by a system frame number (SFN) is constructed in10 ms. A subframe is constructed in 1 ms, and one radio frame contains10 subframes.

A single subframe is divided into two slots. When a normal CP is used, adownlink slot is comprised of 7 OFDM symbols, and an uplink slot iscomprised of 7 SC-FDMA (Single Carrier-Frequency Division MultipleAccess) symbols. In addition, when a long CP (also referred to as“extended CP”) is used, a downlink slot is comprised of 6 OFDM symbols,and an uplink slot is comprised of 6 SC-FDMA symbols.

Further, a single slot is divided into a plurality of slots in thefrequency direction. A single physical resource block (PRB) is comprisedof 12 subcarriers of 15 KHz that are a unit in the frequency direction.As the number of physical resource blocks (PRB), 6 to 110 blocks aresupported corresponding to the system bandwidth. Downlink and uplinkresource allocations are performed on a subframe basis in the timedirection and on a physical resource block (PRB) basis in the frequencydirection. In other words, two slots within a subframe are allocatedusing a single resource allocation signal.

A unit comprised of a subcarrier and OFDM symbol or a subcarrier andSC-FDMA symbol is referred to as a resource element. In resource mappingprocessing in the physical layer, a modulation symbol and the like ismapped to each resource element.

In the processing in the physical layer of the downlink transportchannel is performed addition of 24-bit cyclic redundancy check (CRC) tothe physical downlink shared channel (PDSCH), channel coding(transmission path coding), physical layer HARQ processing, channelinterleaving, scrambling, modulation (QPSK, 16QAM, 64QAM), layermapping, precoding, resource mapping, antenna mapping, etc. Meanwhile,in the processing in the physical layer of the uplink transport channelis performed addition of 24-bit CRC to the physical uplink sharedchannel (PUSCH), channel coding (transmission path coding), physicallayer HARQ processing, scrambling, modulation (QPSK, 16QAM, 64QAM),resource mapping, antenna mapping, etc.

The physical downlink control channel (PDCCH), physical hybrid ARQindicator channel (PHICH) and physical control format indicator channel(PCFICH) are placed within first three OFDM symbols. On the physicaldownlink control channel (PDCCH) are transmitted transport formats(specifying modulation scheme, coding scheme, transport block size,etc.) for the downlink shared channel (DL-SCH), and paging channel(PCH), resource allocation, and HARQ information. Further, on thephysical downlink control channel (PDCCH) are transmitted transportformats (specifying modulation scheme, coding scheme, transport blocksize, etc.) for the uplink shared channel (UL-SCH), resource allocation,and HARQ information. Moreover, a plurality of physical downlink controlchannels (PDCCHs) is supported, and the mobile station apparatusmonitors a set of physical downlink control channels (PDCCHs).

The physical downlink shared channel (PDSCH) assigned by the physicaldownlink control channel (PDCCH) is mapped to the same subframe as thatof the physical downlink control channel (PDCCH). The physical uplinkshared channel (PUSCH) assigned by the physical downlink control channel(PDCCH) is mapped to a subframe in a beforehand determined position. Forexample, when the downlink subframe number on the physical downlinkcontrol channel (PDCCH) is N, the physical uplink shared channel (PUSCH)is mapped to the N+4th uplink subframe.

Further, in uplink/downlink resource allocation by the physical downlinkcontrol channel (PDCCH), the mobile station apparatus is identifiedusing 16-bit MAC layer identification information (MAC ID). In otherwords, this 16-bit MAC layer identification information (MAC ID) isincluded in the physical downlink control channel (PDCCH).

Furthermore, a downlink reference signal (downlink pilot channel) usedfor measurement of downlink conditions and demodulation of downlink datais placed in the first and second OFDM symbols, and third OFDM symbolfrom the last in each slot. Meanwhile, an uplink demodulation referencesignal (demodulation pilot (DRS: Demodulation Reference Signal)) usedfor demodulation of the physical uplink shared channel (PUSCH) istransmitted in the fourth SC-FDMA symbol in each slot. Further, anuplink measurement reference signal (scheduling pilot (SRS: SoundingReference Signal)) used for measurement of uplink conditions istransmitted in the first SC-FDMA symbol of a subframe. A demodulationreference signal of the uplink control channel (PUCCH) is defined foreach format of the uplink control channel, and transmitted in the third,fourth and fifth SC-FDMA symbols in each slot, or the second and sixthSC-FDMA symbols in each slot.

Moreover, the physical broadcast channel (PBCH) and downlinksynchronization signal are placed in a band corresponding to six centerphysical resource blocks in the system band. A physical downlinksynchronization signal is transmitted in the sixth and seventh OFDMsymbols in each slot of the first (subframe number #0) and fifth(subframe number #4) subframes. The physical broadcast channel (PBCH) istransmitted in the fourth and fifth OFDM symbols of the first slot (slot#0) and in the first and second OFDM symbols of the second slot (slot#1) in the first (subframe #0) subframe.

Further, the random access channel (RACH) is comprised of a bandwidthcorresponding to six physical resource blocks in the frequency directionand a single subframe in the time direction, and is transmitted for themobile station apparatus to make a request (request for uplinkresources, request for uplink synchronization, request for downlink datatransmission resume, request for handover, request for connectionsetting, request for reconnection, request for MBMS service, etc.) tothe base station apparatus for various reasons.

The uplink control channel (PUCCH) is placed in opposite ends of thesystem band, and is comprised of a unit physical resource block.Frequency hopping is performed so that the opposite ends of the systemband are used alternately between slots.

A communication system according to the Embodiments is comprised of abase station apparatus 100 and mobile station apparatuses 200.

[Base Station Apparatus]

FIG. 5 is a block diagram illustrating a schematic structure of a basestation apparatus according to the Embodiments. As shown in FIG. 5, thebase station apparatus 100 is comprised of a data control section 101,OFDM modulation section 102, radio section 103, scheduling section 104,channel estimation section 105, DFT-Spread-OFDM (DFT-S-OFDM)demodulation section 106, data extraction section 107, and higher layer108. Further, the radio section 103, scheduling section 104, channelestimation section 105, DFT-Spread-OFDM (DFT-S-OFDM) demodulationsection 106, data extraction section 107 and higher layer 108 constitutea receiving section, and the data control section 101, OFDM modulationsection 102, radio section 103 and scheduling section 104 and higherlayer 108 constitute a transmitting section.

The radio section 103, channel estimation section 105, DFT-Spread-OFDM(DFT-S-OFDM) demodulation section 106, and data extraction section 107perform the processing of the uplink physical layer. The radio section103, DFT-Spread-OFDM (DFT-S-OFDM) demodulation section 106, and dataextraction section 107 perform the processing of the downlink physicallayer.

The data control section 101 receives the transport channel andscheduling information from the scheduling section 104. The data controlsection 101 maps the transport channel and signal and channel generatedin the physical layer on the physical channel based on the schedulinginformation input from the scheduling section 104. Each data mapped asdescribed above is output to the OFDM modulation section 102.

The OFDM modulation section 102 performs OFDM signal processing such ascoding, data modulation, serial/parallel transform of an input signal,IFFT (Inverse Fast Fourier Transform) processing, CP (Cyclic Prefix)insertion and filtering on the data input from the data control section101, based on the scheduling information (including downlink physicalresource block (PRB) allocation information (for example, physicalresource block position information such as the frequency and time),modulation scheme and coding scheme (such as, for example, 16QAM, 2/3coding rate, etc.) corresponding to each PRB, etc.) from the schedulingsection 104, and thereby generates an OFDM signal to output to the radiosection 103.

The radio section 103 up-converts the modulated data input from the OFDMmodulation section 102 into a signal with a radio frequency to generatea radio signal, and transmits the radio signal to the mobile stationapparatus 200 via an antenna (not shown). Further, the radio section 103receives an uplink radio signal from the mobile station apparatus 200via the antenna (not shown), down-coverts the radio signal into abaseband signal, and outputs reception data to the channel estimationsection 105 and DFT-S-OFDM demodulation section 106.

The scheduling section 104 performs the processing of the medium accesscontrol (MAC) layer. The scheduling section 104 performs mapping of thelogical channels and transport channels, downlink and uplink scheduling(HARQ processing, selection of transport format, etc.) and the like. Inthe downlink scheduling, the scheduling section 104 performs theprocessing for selecting a downlink transport format (transmission form)(physical resource block allocation, modulation scheme and codingscheme, etc.) to modulate each data, and retransmission control in HARQ,based on the uplink feedback information (downlink channel feedbackinformation (channel state information (channel quality, the number ofstreams, pre-coding information, etc.), ACK/NACK feedback information inresponse to downlink data, etc.) received from the mobile stationapparatus 200, the information of PRB usable in each mobile stationapparatus, buffer status, the scheduling information input from thehigher layer 108, etc. The scheduling information used in downlinkscheduling is output to the data control section 101.

Further, in the uplink scheduling, the scheduling section 104 performsthe processing for selecting an uplink transport format (transmissionform) (physical resource block allocation, modulation scheme and codingscheme, etc.) to modulate each data, based on an estimation result ofchannel state (radio propagation path conditions) on uplink output fromthe channel estimation section 105, resource allocation request from themobile station apparatus 200, information of PRB usable in each mobilestation 200, the scheduling information input from the higher layer 108,etc. The scheduling information used in uplink scheduling is output tothe data control section 101.

Furthermore, the scheduling section 104 maps the downlink logicalchannel input from the higher layer 108 on the transport channel tooutput to the data control section 101. Moreover, the scheduling section104 performs processing on the control data and transport channel thatis acquired on uplink and input from the data extraction section 107when necessary, and then, maps the resultant on the uplink logicalchannel to output to the higher layer 108.

The channel estimation section 105 estimates uplink channel state froman uplink demodulation reference signal (DRS) to demodulate uplink data,and outputs the estimation result to the DFT-S-OFDM demodulation section106. Further, in order to perform uplink scheduling, the channelestimation section 105 estimates uplink channel state from an uplinkmeasurement reference signal (SRS: Sounding Reference Signal), andoutputs the estimation result to the scheduling section 104. Inaddition, as an uplink communication scheme, a single-carrier scheme isassumed such as DFT-S-OFDM, etc, but a multicarrier scheme may be usedsuch as an OFDM scheme.

The DFT-S-OFDM demodulation section 106 performs DFT-S-OFDM signalprocessing such as DFT transform, subcarrier mapping, IFFT transform,filtering, etc. on modulated data input from the radio section 103 basedon the uplink channel state estimation result input from the channelestimation section 105, and performs demodulation processing on theresultant to output to the data extraction section 107.

The data extraction section 107 checks the data input from theDFT-S-OFDM demodulation section 106 for accuracy or error, and outputsthe checking result (acknowledge signal ACK/negative acknowledge signalNACK) to the scheduling section 104. Further, the data extractionsection 107 divides the data input from the DFT-S-OFDM demodulationsection 106 into the transport channel and control data of the physicallayer to output to the scheduling section 104. The divided control dataincludes the feedback information on uplink (downlink channel feedbackreport CFR, and ACK/NACK feedback information in response to thedownlink data) and the like.

The higher layer 108 performs the processing in the packet dataconvergence protocol (PDCP) layer, radio link control (RLC) layer, andradio resource control (RRC) layer. The higher layer 108 has a radioresource control section 109 (also referred to as a control section).The radio resource control section 109 performs management of variouskinds of setting information, management of system information, pagingcontrol, management of communication conditions of each mobile stationapparatus, moving management such as handover, management of bufferstatus for each mobile station apparatus, management of connectionsettings of unicast and multicast bearers, management of mobile stationidentities (UEID), etc.

[Mobile Station Apparatus]

FIG. 6 is a block diagram illustrating a schematic structure of themobile station apparatus according to the Embodiments. As shown in FIG.6, the mobile station apparatus 200 is comprised of a data controlsection 201, DFT-S-OFDM modulation section 202, radio section 203,scheduling section 204, channel estimation section 205, OFDMdemodulation section 206, data extraction section 207, and higher layer208. Further, the data control section 201, DFT-S-OFDM modulationsection 202, radio section 203, scheduling section 204 and higher layer208 constitute a transmitting section, and the radio section 203,scheduling section 204, channel estimation section 205, OFDMdemodulation section 206, data extraction section 207 and higher layer208 constitute a receiving section. Further, the scheduling section 204constitutes a selecting section.

The data control section 201, DFT-S-OFDM modulation section 202 andradio section 203 perform the processing of the uplink physical layer.The radio section 203, channel estimation section 205, OFDM demodulationsection 206 and data extraction section 207 perform the processing ofthe downlink physical layer.

The data control section 201 receives the transport channel andscheduling information from the scheduling section 204. The data controlsection 201 maps the transport channel and signal and channel generatedin the physical layer on the physical channel based on the schedulinginformation input from the scheduling section 204. Each data mapped asdescribed above is output to the DFT-S-OFDM modulation section 202.

The DFT-S-OFDM modulation section 202 performs DFT-S-OFDM signalprocessing such as data modulation, DFT (Discrete Fourier Transform)processing, subcarrier mapping, IFFT (Inverse Fast Fourier Transform)processing, CP insertion, filtering, etc. on the data input from thedata control section 201, and thereby generates a DFT-S-OFDM signal tooutput to the radio section 203.

In addition, as an uplink communication scheme, a single-carrier schemeis assumed such as DFT-S-OFDM, etc, but may be substituted by amulticarrier scheme such as an OFDM scheme to be used.

The radio section 203 up-converts the modulated data input from theDFT-S-OFDM modulation section 202 into a signal with a radio frequencyto generate a radio signal, and transmits the radio signal to the basestation apparatus 100 via an antenna (not shown).

Further, the radio section 203 receives a radio signal modulated withthe downlink data from the base station apparatus 100 via the antenna(not shown), down-coverts the radio signal into a baseband signal, andoutputs reception data to the channel estimation section 205 and OFDMdemodulation section 206.

The scheduling section 204 performs the processing of the medium accesscontrol (MAC) layer. The scheduling section 204 performs mapping of thelogical channels and transport channels and downlink and uplinkscheduling (HARQ processing, selection of transport format, etc.). Inthe downlink scheduling, the scheduling section 204 performs receptioncontrol of the transport channel, physical signal and physical channeland HARQ retransmission control based on the scheduling information(transport format and HARQ retransmission information) and the like fromthe base station apparatus 100 and higher layer 208.

In the uplink scheduling, the scheduling section 204 performs schedulingprocessing for mapping the uplink logical channel input from the higherlayer 208 on the transport channel based on the uplink buffer statusinput from the higher layer 208, uplink scheduling information(transport format, HARQ retransmission information, etc.) from the basestation apparatus 100 input from the data extraction section 207, andthe scheduling information input from the higher layer 208. In addition,for the uplink transport format, the information notified from the basestation apparatus 100 is used. These kinds of scheduling information areoutput to the data control section 201.

Further, the scheduling section 204 maps the uplink logical channelinput from the higher layer 208 on the transport channel to output tothe data control section 201. Furthermore, the scheduling section 204outputs to the data control section 201 also the downlink channelfeedback report CFR (channel state information) input from the channelestimation section 205, and CRC checking result input from the dataextraction section 207. Moreover, the scheduling section 204 performsprocessing on the control data and transport channel that is acquired ondownlink and input from the data extraction section 207 when necessary,and then, maps the resultant on the downlink logical channel to outputto the higher layer 208.

The channel estimation section 205 estimates downlink channel state froma downlink reference signal (RS) to demodulate downlink data, andoutputs the estimation result to the OFDM demodulation section 206.Further, in order to notify the base station apparatus 100 of theestimation result of the downlink channel state (radio propagation pathconditions), the channel estimation section 205 estimates the downlinkchannel state from the downlink reference signal (RS), and converts theestimation result into the feedback information (channel qualityinformation) about the downlink channel state to output to thescheduling section 204.

The OFDM demodulation section 206 performs OFDM demodulation processingon the modulated data input from the radio section 203 based on thedownlink channel state estimation result input from the channelestimation section 205, and outputs the resultant to the data extractionsection 207.

The data extraction section 207 performs CRC on the data input from theOFDM demodulation section 206 to check for accuracy or error, andoutputs the checking result (ACK/NACK feedback information) to thescheduling section 204. Further, the data extraction section 207 dividesthe data input from the OFDM demodulation section 206 into the transportchannel and control data of the physical layer to output to thescheduling section 204. The divided control data includes the schedulinginformation such as downlink or uplink resource allocation, uplink HARQcontrol information, etc. At this point, the data extraction section 207performs decoding processing on a search space (also referred to as asearch area) of a physical downlink control signal (PDCCH), and extractsdownlink or uplink resource allocation to the mobile station apparatus200, etc.

The higher layer 208 performs the processing in the packet dataconvergence protocol (PDCP) layer, radio link control (RLC) layer, andradio resource control (RRC) layer. The higher layer 208 has a radioresource control section 209 (also referred to as a control section).The radio resource control section 209 performs management of variouskinds of setting information, management of system information, pagingcontrol, management of communication conditions of the mobile stationapparatus 200, moving management such as handover, management of bufferstatus, management of connection settings of unicast and multicastbearers and management of mobile station identity (UEID).

Embodiment 1

Described subsequently is Embodiment 1 of the invention in thecommunication system using the base station apparatus 100 and mobilestation apparatus 200. The mobile station apparatus determines whetherto transmit the channel feedback report CFR using persistently allocateduplink resources (physical uplink shared channel (PUSCH)) or usingtemporarily (one-shot) allocated uplink resources (physical uplinkshared channel (PUSCH)), based on information included in a physicaldownlink control signal (PDCCH) for performing uplink resourceallocation.

The mobile station apparatus transmits the uplink data (uplink sharedchannel: UL-SCH) and the channel feedback report CFR on the persistentlyallocated physical uplink shared channel (PUSCH) when the physicaldownlink control signal (PDCCH) for performing persistent uplinkresource allocation includes the information for requesting the channelfeedback report CFR, while transmitting the uplink data on thepersistently allocated physical uplink shared channel (PUSCH) when thephysical downlink control signal (PDCCH) does not include theinformation for requesting the channel feedback report CFR.

The mobile station apparatus judges whether the control signal is acontrol signal to the mobile station apparatus by determining whetherMAC ID included in the physical downlink control signal (PDCCH) includesa cell-radio network temporary identity (C-RNTI) that is the mobilestation identity of the mobile station apparatus. The MAC ID may beidentified as CRC of the physical downlink control signal (PDCCH), ormay be identified by scramble code of the physical downlink controlsignal (PDCCH). The physical downlink control signal (PDCCH) isidentified as an uplink transmission grant signal or downlink resourceallocation by its bit size and/or flag. The uplink transmission grantsignal includes a channel feedback report request.

Described further is a method of including a signal for requesting totransmit only the channel feedback report CFR (that may include ACK/NACKin response to the downlink data, or the like) without including theuplink data (UL-SCH) in the physical downlink control signal (PDCCH).When a part of transport format is reserved in advance and someparticular information sequence is included in the physical downlinkcontrol signal (PDCCH), it is indicated to request to transmit only thechannel feedback report CFR (for example, a value of five-bit MCS is“11111”, etc.) Alternately, by including a one-bit signal simply in thephysical downlink control signal (PDCCH), a request is instructed totransmit only the channel feedback report CFR. This is called thechannel feedback report dedicated transmission request.

Described next is a specific physical downlink control signal (PDCCH)used for activating persistent scheduling. The base station apparatusassigns to the mobile station apparatus, by RRC signaling, a cell-radionetwork temporary identity (C-RNTI (also referred to as a specialC-RNTI)) that is the mobile station identity indicative of foractivation of persistent scheduling, or a cell-radio network temporaryidentity (C-RNTI (also referred to as a special C-RNTI)) that is themobile station identity indicative of for activation of periodic channelfeedback report, separately from a cell-radio network temporary identity(C-RNTI) used for normal dynamic scheduling. Alternately, a specificscramble code for activation of persistent scheduling (or periodicchannel feedback report) is applied to the physical downlink controlsignal (PDCCH). The other information included in the physical downlinkcontrol signal (PDCCH) is the same both for persistent scheduling (orperiodic channel feedback) and for dynamic scheduling.

Namely, included are the transport format, resource allocation (PRBallocation), HARQ information, channel feedback report request, etc. Inother words, by introducing a mobile station identity indicative of foractivation of persistent scheduling (or periodic channel feedback), itis possible to use a normal physical downlink control signal (PDCCH) forthe persistent scheduling (or periodic channel feedback). Further, whenthe persistent scheduling and periodic channel feedback are concurrentlyset, the same cell-radio network temporary identity (C-RNTI) is used. Bythis means, it is possible to share both mechanisms of the persistentscheduling and periodic channel feedback. In addition, for thepersistent scheduling and periodic channel feedback, differentcell-radio network temporary identities (C-RNTIs) can be assigned.

Described herein is a decoding method of the physical downlink controlsignal (PDCCH). The physical downlink control signal (PDCCH) iscomprised of a set of a plurality of resource element groups, aplurality of corresponding resource element groups exists, there is aplurality of numbers of resource elements included in the physicaldownlink control signal (PDCCH), and the coding rate is variable. Themobile station apparatus decodes all the candidates for placement of thephysical downlink control signal (PDCCH), and by the fact that themobile station identification information of the apparatus is includedand that CRC succeeds, specifies and decodes the physical downlinkcontrol signal (PDCCH) to the apparatus. This processing is called theblind decoding. In order to reduce the number of times of the blinddecoding, the search space (groups of resource elements to decode) ofthe physical downlink control signal (PDCCH) is limited by an output ofhash function based on the cell-radio network temporary identity(C-RNTI) that is the mobile station identity.

However, since the search space of the physical downlink control signal(PDCCH) is increased by newly adding the cell-radio network temporaryidentity (C-RNTI) for persistent scheduling and/or periodic channelfeedback as described above, the cell-radio network temporary identity(C-RNTI) for dynamic scheduling i.e. the cell-radio network temporaryidentity (C-RNTI) that is always assigned to the mobile stationapparatus under communication is always used in input of hash function.

When the mobile station apparatus holds a plurality of cell-radionetwork temporary identities (herein, a cell-radio network temporaryidentity (C-RNTI) for persistent scheduling and/or cell-radio networktemporary identity (C-RNTI) for periodic channel feedback and/orcell-radio network temporary identity (C-RNTI) for dynamic scheduling,the mobile station apparatus searches for a plurality of mobile stationidentities in the search space of the physical downlink control signal(PDCCH) corresponding to a single mobile station identity (herein, thecell-radio network temporary identity (C-RNTI) for dynamic scheduling).When the base station apparatus assigns a plurality of mobile stationidentities to the mobile station apparatus, the base station apparatusplaces physical downlink control signals (PDCCH) including respectivemobile station identities in the search space of the physical downlinkcontrol signal (PDCCH) corresponding to a single mobile stationidentity. By this means, the mobile station apparatus searches foranother cell-radio network temporary identity (C-RNTI) for persistentscheduling or periodic channel feedback, while maintaining the searchspace (also referred to as a search area) of the physical downlinkcontrol signal (PDCCH), and the processing is reduced.

As another method, to limit the search space of physical downlinkcontrol signal (PDCCH), the mobile station apparatus uses a commonsearch space in which the physical downlink control signal (PDCCH) isplaced to be used for scheduling of broadcast information, random accessresponse, etc. The common search space is a search space for all themobile station apparatuses to need to search for the physical downlinkcontrol signal (PDCCH), separately from the search space limited by thecell-radio network temporary identity (C-RNTI) for dynamic scheduling.When the mobile station apparatus searches for another mobile stationidentity except the cell-radio network temporary identity (C-RNTI) fordynamic scheduling, the mobile station apparatus searches the commonsearch space for the cell-radio network temporary identity (C-RNTI) forpersistent scheduling and/or cell-radio network temporary identity(C-RNTI) for periodic channel feedback. The base station apparatusplaces the physical downlink control signal (PDCCH) including thecell-radio network temporary identity (C-RNTI) for persistent schedulingand/or cell-radio network temporary identity (C-RNTI) for periodicchannel feedback in the common search space.

By this means, the mobile station apparatus searches for anothercell-radio network temporary identity (C-RNTI) for persistent schedulingor periodic channel feedback, while maintaining the search space (alsoreferred to as a search area) of the physical downlink control signal(PDCCH), and the processing is reduced.

FIG. 7 is a diagram showing an example of operations of the mobilestation apparatus corresponding to types of physical downlink controlsignals (PDCCH). The operations as shown in FIG. 7 are controlled incooperation between the physical layer and MAC layer of the mobilestation apparatus. When the dynamic physical downlink control signal(PDCCH) is set for a channel feedback report dedicated transmissionrequest, the mobile station apparatus transmits only the channelfeedback report on the designated PUSCH aperiodically in one shot (in asingle transmission, or a single HARQ process).

When the dynamic physical downlink control signal (PDCCH) is set for achannel feedback report request, the mobile station apparatus transmitsthe uplink data (UL-SCH) and the channel feedback report on thedesignated PUSCH aperiodically in one shot. When the dynamic physicaldownlink control signal (PDCCH) is set for neither a channel feedbackreport request nor a channel feedback report dedicated request, themobile station apparatus transmits the uplink data (UL-SCH) on thedesignated PUSCH aperiodically in one shot.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for a channel feedback reportdedicated transmission request, the mobile station apparatus transmitsonly the channel feedback report on the designated PUSCH periodicallyand persistently. The feedback period in this case is a transmissionperiod of periodic channel feedback reports set by RRC signaling.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for a channel feedback report request,the mobile station apparatus transmits the uplink data (UL-SCH) and thechannel feedback report on the designated PUSCH periodically andpersistently. In this case, the persistent scheduling of uplink data andperiodic channel feedback report are concurrently set. The feedbackperiod in this case is a period of persistent scheduling of uplink dataset by RRC signaling.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for neither a channel feedback reportrequest nor a channel feedback report dedicated request, the mobilestation apparatus transmits the uplink data (UL-SCH) on the designatedPUSCH periodically and persistently. The feedback period in this case isa period of persistent scheduling of uplink data set by RRC signaling.

Described next is a method of halting (deactivating) the persistentscheduling of uplink data and periodic channel feedback report. To halt(deactivate) the persistent scheduling of uplink data and periodicchannel feedback report, an uplink grant of “no uplink resourceallocation” is transmitted in the physical downlink control signal(PDCCH). Herein, “no uplink resource allocation” is identified by theresource allocation information included in the uplink grant being abeforehand determined particular value.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for “no uplink resource allocation”and a channel feedback report dedicated transmission request, the mobilestation apparatus halts only the periodic channel feedback report.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for “no uplink resource allocation”and a channel feedback report request, the mobile station apparatushalts the persistent scheduling of uplink data being used or theperiodic channel feedback report. When both of them are used, the mobilestation apparatus concurrently halts the persistent scheduling of uplinkdata and the periodic channel feedback report.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for “no uplink resource allocation”while being set for neither a channel feedback report request nor achannel feedback report dedicated request, the mobile station apparatushalts only the persistent scheduling of uplink data.

FIG. 8 is a diagram showing another example of operations of the mobilestation apparatus corresponding to types of physical downlink controlsignals (PDCCH). When the dynamic physical downlink control signal(PDCCH) is not set for a channel feedback report request, while beingset for a channel feedback report dedicated transmission request, themobile station apparatus transmits only the channel feedback report onthe designated PUSCH periodically and persistently. The feedback periodin this case is a transmission period of periodic channel feedbackreports set by RRC signaling. By this means, without using thepersistent physical downlink control signal (PDCCH), it is possible toactivate the periodic channel feedback report.

When the dynamic physical downlink control signal (PDCCH) is set for achannel feedback report request, while being not set for a channelfeedback report dedicated transmission request, the mobile stationapparatus transmits the uplink data (UL-SCH) and the channel feedbackreport on the designated PUSCH aperiodically in one shot. When thedynamic physical downlink control signal (PDCCH) is set for both of achannel feedback report request and a channel feedback report dedicatedrequest, the mobile station apparatus transmits only the channelfeedback report on the designated PUSCH aperiodically in one shot.

When the dynamic physical downlink control signal (PDCCH) is set forneither a channel feedback report request nor a channel feedback reportdedicated request, the mobile station apparatus transmits only theuplink data (UL-SCH) on the designated PUSCH aperiodically in one shot.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is not set for a channel feedback reportrequest, while being set for a channel feedback report dedicatedtransmission request, the physical downlink control signal (PDCCH) isused for other uses.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for a channel feedback report request,while being not set for a channel feedback report dedicated transmissionrequest, the mobile station apparatus transmits the uplink data (UL-SCH)and channel feedback report on the designated PUSCH periodically andpersistently. In this case, the persistent scheduling of uplink data(UL-SCH) and periodic channel feedback report are concurrently set. Thefeedback period in this case is a period of persistent scheduling ofuplink data (UL-SCH) set by RRC signaling.

By this means, it is possible to enable the channel feedback reportconcurrently with the uplink data (UL-SCH), and resources and consumedpower can be used effectively. As another method, to the feedback periodin this case is applied concurrently the period of persistent schedulingof uplink data (UL-SCH) and the transmission period of periodic channelfeedback reports set by RRC signaling. In this way, by a single physicaldownlink control signal (PDCCH), it is possible to concurrently activatethe period of persistent scheduling of uplink data (UL-SCH) and theperiodic channel feedback report.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for both of a channel feedback reportrequest and a channel feedback report dedicated transmission request,the mobile station apparatus transmits only the channel feedback reporton the designated PUSCH periodically and persistently. The feedbackperiod in this case is a period of periodic channel feedback reports setby RRC signaling.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for neither a channel feedback reportrequest nor a channel feedback report dedicated request, the mobilestation apparatus transmits the uplink data (UL-SCH) on the designatedPUSCH periodically and persistently. The feedback period in this case isa period of persistent scheduling of uplink data set by RRC signaling.

Described next is a method of halting (deactivating) the persistentscheduling of uplink data and periodic channel feedback report. To halt(deactivate) the persistent scheduling of uplink data and periodicchannel feedback report, an uplink grant of “no uplink resourceallocation” is transmitted in the physical downlink control signal(PDCCH). Herein, “no uplink resource allocation” is identified by theresource allocation information included in the uplink grant being abeforehand determined particular value.

When the dynamic physical downlink control signal (PDCCH) is not set fora channel feedback report request, while being set for “no uplinkresource allocation” and a channel feedback report dedicatedtransmission request, the mobile station apparatus halts only theperiodic channel feedback report.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is not set for a channel feedback reportrequest, while being set for “no uplink resource allocation” and achannel feedback report dedicated transmission request, the mobilestation apparatus halts the persistent scheduling of uplink data beingused or the periodic channel feedback report. When both of them areused, the mobile station apparatus concurrently halts the persistentscheduling of uplink data and the periodic channel feedback report.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for “no uplink resource allocation”and a channel feedback report request, while being not set for a channelfeedback report dedicated transmission request, the mobile stationapparatus halts the persistent scheduling of uplink data being used orthe periodic channel feedback report. When both of them are used, themobile station apparatus concurrently halts the persistent scheduling ofuplink data and the periodic channel feedback report.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for “no uplink resource allocation”, achannel feedback report request and a channel feedback report dedicatedtransmission request, the mobile station apparatus halts only theperiodic channel feedback report.

When the physical downlink control signal (PDCCH) for persistent (orperiodic channel feedback) is set for “no uplink resource allocation”,while being set for neither a channel feedback report request nor achannel feedback report dedicated request, the mobile station apparatushalts only the persistent scheduling of uplink data.

FIG. 9 is a diagram showing still another example of operations of themobile station apparatus corresponding to types of physical downlinkcontrol signals (PDCCH). In this example, different cell-radio networktemporary identities (C-RNTIs) are assigned for persistent schedulingand periodic channel feedback. The operations as shown in FIG. 9 arecontrolled in cooperation between the physical layer and MAC layer ofthe mobile station apparatus. When the dynamic physical downlink controlsignal (PDCCH) is set for a channel feedback report dedicatedtransmission request, the mobile station apparatus transmits only thechannel feedback report on the designated PUSCH aperiodically in oneshot (in a single transmission, or a single HARQ process).

When the dynamic physical downlink control signal (PDCCH) is set for achannel feedback report request, the mobile station apparatus transmitsthe uplink data (UL-SCH) and the channel feedback report on thedesignated PUSCH aperiodically in one shot. When the dynamic physicaldownlink control signal (PDCCH) is set for neither a channel feedbackreport request nor a channel feedback report dedicated request, themobile station apparatus transmits the uplink data (UL-SCH) on thedesignated PUSCH aperiodically in one shot.

When the persistent physical downlink control signal (PDCCH) is set fora channel feedback report request, the mobile station apparatustransmits the uplink data (UL-SCH) and the channel feedback report onthe designated PUSCH periodically and persistently. In this case, thepersistent scheduling of uplink data and periodic channel feedbackreport are concurrently set. The feedback period in this case is aperiod of persistent scheduling of uplink data set by RRC signaling.

When the persistent physical downlink control signal (PDCCH) is set forneither a channel feedback report request nor a channel feedback reportdedicated request, the mobile station apparatus transmits the uplinkdata (UL-SCH) on the designated PUSCH periodically and persistently. Thefeedback period in this case is a period of persistent scheduling ofuplink data set by RRC signaling.

When the mobile station apparatus receives the physical downlink controlsignal (PDCCH) for periodic channel feedback, the mobile stationapparatus transmits only the channel feedback report on the designatedPUSCH periodically and persistently without including the uplink data(UL-SCH). The feedback period in this case is a period of periodicchannel feedback reports set by RRC signaling.

Described next is a method of halting (deactivating) the persistentscheduling of uplink data and periodic channel feedback report. To halt(deactivate) the persistent scheduling of uplink data and periodicchannel feedback report, an uplink grant of “no uplink resourceallocation” is transmitted in the physical downlink control signal(PDCCH). Herein, “no uplink resource allocation” is identified by theresource allocation information included in the uplink grant being abeforehand determined particular value.

When the persistent physical downlink control signal (PDCCH) is set for“no uplink resource allocation” and a channel feedback report request,the mobile station apparatus halts the persistent scheduling of uplinkdata being used or the periodic channel feedback report. When both ofthem are used, the mobile station apparatus concurrently halts thepersistent scheduling of uplink data and the periodic channel feedbackreport.

When the persistent physical downlink control signal (PDCCH) is set for“no uplink resource allocation”, while being set for neither a channelfeedback report request nor a channel feedback report dedicated request,the mobile station apparatus halts only the persistent scheduling ofuplink data.

When the physical downlink control signal (PDCCH) for periodic channelfeedback is set for “no uplink resource allocation”, the mobile stationapparatus halts the periodic channel feedback report.

In Embodiment 1, for the timing of the PUSCH of the periodic channelfeedback report and uplink persistent scheduling, it is the premise touse the PUSCH in a subframe of timing in response to an uplinktransmission grant signal. By this means, it is possible to performdynamically fast resource allocation.

Meanwhile, a subframe offset may be set by RRC signaling. There are seta subframe offset of the periodic channel feedback report and a subframeoffset of the persistent scheduling of uplink data. In this case, thetiming of the PUSCH of the periodic channel feedback report and uplinkpersistent scheduling is designated by RRC signaling. By this means, itis possible to perform more robust resource allocation.

FIG. 10 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to the dynamic physical downlink control signals (PDCCH)as shown in FIG. 7. The base station apparatus transmits a dynamicuplink grant to the mobile station apparatus in the physical downlinkcontrol signal (PDCCH) in D-subframe#2. This uplink grant includes achannel feedback report dedicated request. The mobile station apparatusreceiving the channel feedback report dedicated request in D-subframe#2performs uplink transmission on the PUSCH including only the channelfeedback report CFR in U-subframe#6.

The base station apparatus transmits a dynamic uplink grant to themobile station apparatus in the physical downlink control signal (PDCCH)in D-subframe#8. This uplink grant includes a channel feedback reportrequest. The mobile station apparatus receiving the channel feedbackreport request in D-subframe#8 performs uplink transmission on the PUSCHincluding the channel feedback report CFR and uplink data (UL-SCH) inU-subframe#12.

The base station apparatus transmits a dynamic uplink grant to themobile station apparatus in the physical downlink control signal (PDCCH)in D-subframe#14. This uplink grant includes neither a channel feedbackreport request nor a channel feedback report dedicated request. Themobile station apparatus receiving the uplink grant in D-subframe#14performs uplink transmission on the PUSCH that does not include thechannel feedback report CFR in U-subframe#18.

FIG. 11 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to the case where a channel feedback report dedicatedrequest is designated by a persistent (or periodic channel feedback)physical downlink control signal (PDCCH) shown in FIG. 7. The mobilestation apparatus and base station apparatus beforehand make settingsfor the periodic channel feedback report by transmitting and receivingRRC signaling. The settings include a cell-radio network temporaryidentity (C-RNTI) that is the mobile station identity indicative of foractivation of periodic channel feedback report, reporting formats ofperiodic feedback reports (wide-band report, mobile-station selectionsub-band report, base-station selection sub-band report, etc.), feedbackperiod (transmission interval) and the like.

The base station apparatus transmits an uplink grant for periodicchannel feedback to the mobile station apparatus in the physicaldownlink control signal (PDCCH) in D-subframe#2. This uplink grantincludes a channel feedback report dedicated request. The mobile stationapparatus receiving the channel feedback report dedicated request inD-subframe#2 performs uplink transmission on the PUSCH including onlythe channel feedback report CFR at 2-subframe intervals (assuming thatthe transmission interval is set at two subframes (2 ms) by RRCsignaling) from U-subframe#6.

The base station apparatus transmits an uplink grant for periodicchannel feedback of “no uplink resource allocation” in the physicaldownlink control signal (PDCCH) in D-subframe#18. Herein, “no uplinkresource allocation” is identified by the resource allocationinformation included in the uplink grant being a beforehand determinedparticular value. The mobile station apparatus receiving the uplinkgrant for periodic channel feedback of “no uplink resource allocation”in D-subframe#18 halts periodic channel feedback.

FIG. 12 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to the case where a channel feedback report request isdesignated by a persistent (or periodic channel feedback) physicaldownlink control signal (PDCCH) shown in FIG. 7. The mobile stationapparatus and base station apparatus beforehand make settings for theperiodic channel feedback report by transmitting and receiving RRCsignaling. The settings include reporting formats of periodic feedbackreports (wide-band report, mobile-station selection sub-band report,base-station selection sub-band report, etc.), feedback period(transmission interval) and the like.

Further, the mobile station apparatus and base station apparatusbeforehand make settings for persistent scheduling by transmitting andreceiving RRC signaling. The settings include a cell-radio networktemporary identity (C-RNTI) that is the mobile station identityindicative of for activation of persistent scheduling, period(transmission interval) and the like. In the following description, itis assumed that the channel feedback report period is set at fivesubframes (5 ms) and that the persistent scheduling period is set at tensubframes (10 ms) by RRC signaling.

The base station apparatus transmits a persistent uplink grant to themobile station apparatus in the physical downlink control signal (PDCCH)in D-subframe#2. This uplink grant includes a channel feedback reportrequest. The mobile station apparatus receiving the channel feedbackreport request in D-subframe#2 performs uplink transmission on the PUSCHincluding only the channel feedback report CFR at 10-subframe intervalsfrom U-subframe#11, while performing uplink transmission on the PUSCHincluding the channel feedback report CFR and uplink data (UL-SCH) at10-subframe intervals from U-subframe#6.

In other words, the mobile station apparatus transmits concurrently thechannel feedback report CFR and uplink data on the PUSCH in subframeswhere a channel feedback report transmission subframe coincides with apersistent scheduling transmission subframe. The base station apparatustransmits a persistent uplink grant of “no uplink resource allocation”in the physical downlink control signal (PDCCH) in D-subframe#30.Herein, “no uplink resource allocation” is identified by the resourceallocation information included in the uplink grant being a beforehanddetermined particular value.

The mobile station apparatus receiving the persistent uplink grant of“no uplink resource allocation” in D-subframe#30 halts transmission ofperiodic channel feedback and/or uplink data (UL-SCH) with persistentresources. Which is halted is included in the persistent uplink grant,and is determined by a combination of the channel feedback reportrequest, channel feedback report dedicated request and “no uplinkresource allocation”.

FIG. 13 is a diagram showing another example of transmission/receptionof signals between the mobile station apparatus and base stationapparatus corresponding to the case where a channel feedback reportrequest is designated by a persistent (or periodic channel feedback)physical downlink control signal (PDCCH) shown in FIG. 7. The mobilestation apparatus and base station apparatus beforehand make settingsfor the periodic channel feedback report by transmitting and receivingRRC signaling. The settings include reporting formats of periodicfeedback reports (wide-band report, mobile-station selection sub-bandreport, base-station selection sub-band report, etc.), feedback period(transmission interval) and the like.

Further, the mobile station apparatus and base station apparatusbeforehand make settings for persistent scheduling by transmitting andreceiving RRC signaling. The settings include a cell-radio networktemporary identity (C-RNTI) that is the mobile station identityindicative of for activation of persistent scheduling, period(transmission interval) and the like. In the following description, itis assumed that the channel feedback report period is set at fivesubframes (5 ms) and that the persistent scheduling period is set at tensubframes (10 ms) by RRC signaling.

The base station apparatus transmits a persistent uplink grant to themobile station apparatus in the physical downlink control signal (PDCCH)in D-subframe#2. This uplink grant includes a channel feedback reportrequest. The mobile station apparatus receiving the channel feedbackreport request in D-subframe#2 performs uplink transmission on the PUSCHincluding the channel feedback report CFR and uplink data (UL-SCH) at10-subframe intervals from U-subframe#6.

In other words, the channel feedback report CFR is transmitted only inpersistent scheduling transmission subframes. The base station apparatustransmits a periodic channel feedback uplink grant of “no uplinkresource allocation” in the physical downlink control signal (PDCCH) inD-subframe#30. Herein, “no uplink resource allocation” is identified bythe resource allocation information included in the uplink grant being abeforehand determined particular value.

The mobile station apparatus receiving the periodic channel feedbackuplink grant of “no uplink resource allocation” in D-subframe#30 haltstransmission of periodic channel feedback and/or uplink data (UL-SCH)with persistent resources. Which is halted is included in the persistentuplink grant, and is determined by a combination of the channel feedbackreport request, channel feedback report dedicated request and “no uplinkresource allocation”.

FIG. 14 is a diagram showing an example of transmission/reception ofsignals between the mobile station apparatus and base station apparatuscorresponding to the case where a channel feedback report dedicatedrequest is designated by a persistent (or periodic channel feedback)physical downlink control signal (PDCCH) shown in FIG. 7. The mobilestation apparatus and base station apparatus beforehand make settingsfor persistent scheduling by transmitting and receiving RRC signaling.The settings include a cell-radio network temporary identity (C-RNTI)that is the mobile station identity indicative of for activation ofpersistent scheduling, period (transmission interval) and the like.

The base station apparatus transmits a persistent uplink grant to themobile station apparatus in the physical downlink control signal (PDCCH)in D-subframe#2. This uplink grant includes neither a channel feedbackreport request nor a channel feedback report dedicated request. Themobile station apparatus receiving the normal persistent uplink grant inD-subframe#2 transmits uplink data (UL-SCH) on the PUSCH withoutincluding the channel feedback report CFR at 2-subframe intervals(assuming that the transmission interval is set at two subframes (2 ms)by RRC signaling) from U-subframe#6.

The base station apparatus transmits a persistent uplink grant of “nouplink resource allocation” in the physical downlink control signal(PDCCH) in D-subframe#18. Herein, “no uplink resource allocation” isidentified by the resource allocation information included in the uplinkgrant being a beforehand determined particular value. The mobile stationapparatus receiving the persistent uplink grant of “no uplink resourceallocation” in D-subframe#18 halts transmission of uplink data (UL-SCH)with persistent resources.

In addition, when a temporary channel feedback report is requested in asubframe for transmission of uplink data (UL-SCH) with persistentresources or transmission of periodic channel feedback, the mobilestation apparatus transmits the uplink data (UL-SCH) and temporarychannel feedback report with resources in response to the uplink grantfor requesting the temporary channel feedback report. In other words,the temporary channel feedback report is written over transmission ofthe uplink data (UL-SCH) with persistent resources and transmission ofperiodic channel feedback.

Further, when a temporary channel feedback report dedicated transmissionis requested in a subframe for transmission of uplink data (US-SCH) withpersistent resources or transmission of periodic channel feedback, themobile station apparatus transmits the temporary channel feedback reportwith resources in response to the uplink grant for requesting thetemporary channel feedback report without including the uplink data(UL-SCH). Meanwhile, when an uplink grant that does not include atemporary channel feedback report request is received in a subframe fortransmission of uplink data (UL-SCH) with persistent resources, theuplink data (UL-SCH) is transmitted with resources in response to theuplink grant. Further, when an uplink grant that does not include atemporary channel feedback report request is received in a subframe fortransmission of periodic channel feedback, the periodic channel feedbackreport is transmitted with resources in response to the uplink grant.

FIGS. 10 to 14 are described based on interpretation of the persistent(or periodic channel feedback) physical downlink control signal (PDCCH)as shown in FIG. 7, but can be applicable to the persistent (or periodicchannel feedback) physical downlink control signal (PDCCH) as shown inFIGS. 8 and 9 with ease.

As described above, according to Embodiment 1, it is possible toactivate persistent scheduling of PUSCH for uplink data and PUSCHpersistent allocation for the periodic channel feedback report CFR usinga common instruction signal. By this means, the system design can besimplified. Further, the base station apparatus is able to dynamicallyswitch between the dynamically persistent channel feedback report andtemporary channel feedback report in response to use status of uplinkresources, downlink channel state, downlink data buffer amount, etc.Furthermore, the base station apparatus is able to dynamically startperiodic channel feedback and aperiodical channel feedback. Moreover, itis possible to dynamically change transmission of only channel feedbackand concurrent transmission of channel feedback and uplink data.

Embodiment 2

For convenience in description, Embodiment 1 describes as an example thecase where the base station apparatus and mobile station apparatus isone-to-one, but is naturally applicable to the case that there arepluralities of base station apparatuses and mobile station apparatuses.Further, the mobile station apparatus is not limited to movingterminals, and is applicable to cases that the base station apparatus orfixed terminal is installed with the functions of the mobile stationapparatus. Furthermore, in the above-mentioned Embodiment, programs forimplementing each function in the base station apparatus and eachfunction in the mobile station apparatus are stored in a computerreadable storage medium, the programs stored in the storage medium isread by a computer system to execute, and control of the base stationapparatus and mobile station apparatus can thereby be performed. Inaddition, the “computer system” described herein includes OS, hardwaresuch as peripheral apparatuses, etc.

Further, the “computer readable storage medium” means transportablemedia such as flexible discs, magneto-optical disks, ROM, CD-ROM, etc.and storage devices such as hard disks, etc. built into the computersystem. Furthermore, the “computer readable storage medium” includesmedia for dynamically holding the program during a short time such as acommunication line when the program is transmitted via a network such asthe Internet, etc. or a communication channel such as the telephoneline, etc, and media for holding the program for a certain time such asvolatile memory inside the computer system that is a server or client inthe aforementioned case. Still furthermore, the above-mentioned programmay be to implement a part of the functions as described previously, andmoreover, may be implemented by a combination with a program of thefunctions as described previously already stored in the computer system.

As described above, in this Embodiment, it is possible to adopt thefollowing structures. In other words, the mobile station apparatusaccording to this Embodiment is characterized by selecting either one ofpersistently allocated uplink resources and temporarily allocated uplinkresources as uplink resources to transmit a channel feedback reportbased on information included in a downlink control signal forperforming uplink resource allocation received from a base stationapparatus.

Thus, the mobile station apparatus selects either one of persistentlyallocated uplink resources and temporarily allocated uplink resources asuplink resources to transmit a channel feedback report based on theinformation included in a downlink control signal, and is therebycapable of efficiently switching between persistently and temporarilyallocated uplink resources. The base station apparatus is able todynamically switch between dynamically persistent and temporary channelfeedback reports in response to use status of uplink resources, downlinkchannel state, downlink buffer amount and the like. As a result, themobile station apparatus can transmit a channel feedback report to thebase station apparatus using an efficient signal. Furthermore, it ispossible to simplify the system design.

Further, the mobile station apparatus according to this Embodiment ischaracterized by transmitting the uplink data and channel feedbackreport to the base station apparatus with persistently allocated uplinkresources when the downlink control signal includes information forrequesting the channel feedback report, while transmitting the uplinkdata to the base station apparatus with persistently allocated uplinkresources when the downlink control signal does not include theinformation for requesting the channel feedback report.

Thus, when the downlink control signal includes the information forrequesting the channel feedback report, the mobile station apparatustransmits the uplink data and channel feedback report to the basestation apparatus with persistently allocated uplink resources,persistent scheduling of uplink data and periodic channel feedbackreport are thereby concurrently set, and it is possible to share theboth mechanisms. Further, since the channel feedback report istransmitted concurrently with the uplink data, it is possible toeffectively use resources and consumed power. Meanwhile, when thedownlink control signal does not include the information for requestingthe channel feedback report, the mobile station apparatus transmits theuplink data to the base station apparatus with persistently allocateduplink resources, and is thereby able to dynamically switch betweenconcurrent transmission of the channel feedback report and uplink dataand transmission of only the uplink data.

Further, the mobile station apparatus according to this Embodiment ischaracterized by transmitting a channel feedback report to the basestation apparatus with persistently allocated uplink resources when thedownlink control signal includes information for requesting only thechannel feedback report without including uplink data.

Thus, when the downlink control signal includes information forrequesting only the channel feedback report without including uplinkdata, the mobile station apparatus transmits the channel feedback reportto the base station apparatus with persistently allocated uplinkresources, and is thereby capable of switching between transmission ofonly the channel feedback report and concurrent transmission of thechannel feedback report and uplink data. Moreover, the mobile stationapparatus can transmit the channel feedback report to the base stationapparatus using an efficient signal.

Further, the mobile station apparatus according to this Embodiment ischaracterized by halting operation of transmitting a channel feedbackreport to the base station apparatus with persistently allocated uplinkresources when the downlink control signal includes informationindicative of no resource allocation.

Thus, when the downlink control signal includes information indicativeof no resource allocation, the mobile station apparatus halts operationof transmitting a channel feedback report to the base station apparatuswith persistently allocated uplink resources, and is thereby able todynamically switch between transmission and transmission halt of thechannel feedback report.

Further, the mobile station apparatus according to this Embodiment is amobile station apparatus for performing radio communications with a basestation apparatus, and is characterized by having a mobile station sidereceiving section for receiving a downlink control signal for performinguplink resource allocation from the base station apparatus, a selectingsection for selecting either one of persistently allocated uplinkresources and temporarily allocated uplink resources as resources totransmit a channel feedback report to the base station apparatus basedon information included in the downlink control signal, and a mobilestation side transmitting section for transmitting the channel feedbackreport to the base station apparatus with the selected uplink resources.

Thus, the mobile station apparatus selects either one of persistentlyallocated uplink resources and temporarily allocated uplink resources asuplink resources to transmit a channel feedback report based oninformation included in the downlink control signal, and is therebycapable of efficiently switching between persistently and temporarilyallocated uplink resources. As a result, the mobile station apparatuscan transmit a channel feedback report to the base station apparatususing an efficient signal. Moreover, it is possible to simplify thesystem design.

Further, a base station apparatus according to this Embodiment ischaracterized by including information for enabling a mobile stationapparatus to select either one of persistently allocated uplinkresources and temporarily allocated uplink resources as uplink resourcesto transmit a channel feedback report in a downlink control signal forperforming uplink resource allocation to transmit.

Thus, the base station apparatus includes the information for enabling amobile station apparatus to select either one of persistently allocateduplink resources and temporarily allocated uplink resources as uplinkresources to transmit a channel feedback report in a downlink controlsignal for performing uplink resource allocation to transmit, and isthus capable of efficiently switching between persistently andtemporarily allocated uplink resources. As a result, the base stationapparatus is able to request the mobile station apparatus to transmitthe channel feedback report using an efficient signal. Moreover, it ispossible to simplify the system design.

Further, the base station apparatus according to this Embodiment ischaracterized by requesting the mobile station apparatus to transmit theuplink data and channel feedback report with persistently allocateduplink resources by including information for requesting the channelfeedback report in the downlink control signal, while requesting themobile station apparatus to transmit the uplink data with persistentlyallocated uplink resources by not including the information forrequesting the channel feedback report in the downlink control signal.

Thus, by including the information for requesting the channel feedbackreport in the downlink control signal, the base station apparatusrequests the mobile station apparatus to transmit the uplink data andchannel feedback report with persistently allocated uplink resources,the mobile station apparatus is thereby concurrently set for persistentscheduling of uplink data and periodic channel feedback report, and itis thus possible to share both the mechanisms. Further, the base stationapparatus instructs the mobile station apparatus to transmit the channelfeedback report concurrently with the uplink data, and it is therebypossible to effectively use resources and consumed power. Furthermore,by not including the information for requesting the channel feedbackreport in the downlink control signal, the base station apparatusrequests the mobile station apparatus to transmit the uplink data withpersistently allocated uplink resources, and is thereby able to enablethe mobile station apparatus to dynamically switch between concurrenttransmission of the channel feedback report and uplink data andtransmission of only the uplink data.

Further, the base station apparatus according to this Embodiment ischaracterized by requesting the mobile station apparatus to transmit achannel feedback report with persistently allocated uplink resources byincluding information for requesting only the channel feedback report ina downlink control signal without including uplink data.

Thus, the base station apparatus requests the mobile station apparatusto transmit a channel feedback report with persistently allocated uplinkresources by including the information for requesting only the channelfeedback report in the downlink control signal without including uplinkdata, and the mobile station apparatus is thereby capable of dynamicallyswitching between transmission of only the channel feedback report andconcurrent transmission of the channel feedback report and uplink data.Moreover, the base station apparatus can request the mobile stationapparatus to transmit the channel feedback report using an efficientsignal.

Further, the base station apparatus according to this Embodiment ischaracterized by requesting the mobile station apparatus to haltoperation of transmitting a channel feedback report with persistentlyallocated uplink resources by including information indicative of noresource allocation in the downlink control signal.

Thus, by including the information indicative of no resource allocationin the downlink control signal, the base station apparatus requests themobile station apparatus to halt operation of transmitting a channelfeedback report with persistently allocated uplink resources, and themobile station apparatus is thereby capable of dynamically switchingbetween transmission and transmission halt of the channel feedbackreport.

Further, the base station apparatus according to this Embodiment is abase station apparatus for performing radio communications with a mobilestation apparatus, and is characterized by having a scheduling sectionfor generating information for assigning either one of persistentlyallocated uplink resources and temporarily allocated uplink resources tothe mobile station apparatus as uplink resources to transmit a channelfeedback report based on information including a channel feedback reportreceived from the mobile station apparatus and scheduling informationinput from a higher layer, and performing scheduling for including thegenerated information in a downlink control signal for performing uplinkresource allocation, and a base station side transmitting section fortransmitting the downlink control signal to the mobile stationapparatus.

Thus, the base station apparatus includes the information for the mobilestation apparatus to select either one of persistently allocated uplinkresources and temporarily allocated uplink resources as uplink resourcesto transmit a channel feedback report in a downlink control signal forperforming uplink resource allocation to transmit, and the mobilestation apparatus is thereby capable of efficiently switching betweenpersistently and temporarily allocated uplink resources. As a result,the base station apparatus can request the mobile station apparatus totransmit the channel feedback report using an efficient signal.Moreover, it is possible to simplify the system design.

Further, a communication system according to this Embodiment ischaracterized by being comprised of the mobile station apparatus andbase station apparatus as described previously.

According to this structure, the base station apparatus includes theinformation for the mobile station apparatus to select either one ofpersistently allocated uplink resources and temporarily allocated uplinkresources as uplink resources to transmit a channel feedback report in adownlink control signal for performing uplink resource allocation totransmit, and the mobile station apparatus is thereby capable ofefficiently switching between persistently and temporarily allocateduplink resources. As a result, the base station apparatus can requestthe mobile station apparatus to transmit the channel feedback reportusing an efficient signal. Moreover, it is possible to simplify thesystem design.

Further, the mobile station apparatus according to this Embodiment is amobile station apparatus for determining an space of a downlink controlsignal to search based on a mobile station identity received from a basestation apparatus, and is characterized by searching a search space of adownlink control signal corresponding to one mobile station identity fora plurality of mobile station identities when the mobile stationapparatus holds the plurality of mobile station identities.

Thus, when the mobile station apparatus holds a plurality of mobilestation identities, the mobile station apparatus searches the searchspace of a downlink control signal corresponding to one mobile stationidentity for the plurality of mobile station identities, and it isthereby possible to limit the search space. As a result, since the needof decoding a plurality of times is eliminated, it is possible to reducepower consumption and to decrease the circuit scale.

Further, the mobile station apparatus according to this Embodiment is amobile station apparatus for determining an space of a downlink controlsignal to search based on a mobile station identity received from a basestation apparatus, and is characterized by searching a search space of acommon downlink control signal that does not depend on the mobilestation identity for a mobile station identity for persistent schedulingwhen the mobile station apparatus holds the plurality of mobile stationidentities.

Thus, when the mobile station apparatus holds a plurality of mobilestation identities, the mobile station apparatus searches the searchspace of a common downlink control signal that does not depend on themobile station identity for the mobile station identity for persistentscheduling, thus searches for another cell-radio network temporaryidentity for persistent scheduling or periodic channel feedback, whilemaintaining the search space (also referred to as a search area) of thephysical downlink control signal, and is capable of reducing theprocessing.

Further, the base station apparatus according to this Embodiment is abase station apparatus for transmitting a mobile station identity to amobile station apparatus, and thereby defining an space of a downlinkcontrol signal for the mobile station apparatus to search, and ischaracterized by placing downlink control signals including respectivemobile station identities in a search space of a downlink control signalcorresponding to one mobile station identity when the base stationapparatus assigns a plurality of mobile station identities to the mobilestation apparatus.

Thus, when the base station apparatus assigns a plurality of mobilestation identities to the mobile station apparatus, the base stationapparatus places downlink control signals respectively including themobile station identities in a search space of a downlink control signalcorresponding to one mobile station identity, and is thereby capable oflimiting the search space in the mobile station apparatus. As a result,in the mobile station apparatus, since the need of performing decodingmany times is eliminated, it is possible to reduce power consumption,and to decrease the circuit scale.

Further, the base station apparatus according to this Embodiment is abase station apparatus for transmitting a mobile station identity to amobile station apparatus, and thereby defining an space of a downlinkcontrol signal for the mobile station apparatus to search, and ischaracterized by placing a downlink control signal including a mobilestation identity for persistent scheduling in a search space of a commondownlink control signal that does not depend on the mobile stationidentity when the base station apparatus assigns a plurality of mobilestation identities to the mobile station apparatus.

Thus, when the base station apparatus assigns a plurality of mobilestation identities to the mobile station apparatus, since the basestation apparatus places a downlink control signal including a mobilestation identity for persistent scheduling in the search space of acommon downlink control signal that does not depend on the mobilestation identity, the mobile station apparatus thereby searches foranother cell-radio network temporary identity for persistent schedulingor periodic channel feedback, while maintaining the search space (alsoreferred to as a search area) of the physical downlink control signal,and is able to reduce the processing.

In the forgoing, the Embodiments of the invention are describedspecifically with reference to the drawings, but specific structures arenot limited to the Embodiments, and designs and others in the scopewithout departing from the subject matter of the invention are includedin the scope of claims.

DESCRIPTION OF SYMBOLS

-   -   100 Base station apparatus    -   101 Data control section    -   102 OFDM modulation section    -   103 Radio section    -   104 Scheduling section    -   105 Channel estimation section    -   106 DFT-S-OFDM demodulation section    -   107 Data extraction section    -   108 Higher layer    -   109 Radio resource control section    -   200 Mobile station apparatus    -   201 Data control section    -   202 DFT-S-OFDM modulation section    -   203 Radio section    -   204 Scheduling section    -   205 Channel estimation section    -   206 OFDM demodulation section    -   207 Data extraction section    -   208 Higher layer    -   209 Radio resource control section

The invention claimed is:
 1. A mobile communication system in which amobile station apparatus searches for a physical downlink controlchannel (PDCCH) transmitted by a base station apparatus in a searchspace, the search space comprising a plurality of resource elements, thesearch space corresponding to a cell-radio network temporary identity(C-RNTI) for dynamic scheduling, the mobile communication systemcomprising: the base station apparatus configured to transmit, to themobile station apparatus, the PDCCH in the search space, the PDCCHincluding both a C-RNTI for persistent scheduling and resourceallocation information set to a predetermined value; and the mobilestation apparatus configured: to search for the PDCCH in the searchspace, the search space being located by the mobile station apparatusaccording to the C-RNTI for dynamic scheduling; and to decode the PDCCHaccording to the C-RNTI for persistent scheduling, when the mobilestation apparatus has both the C-RNTI for dynamic scheduling and theC-RNTI for persistent scheduling; wherein the mobile station apparatusis further configured to halt data transmission onpersistently-allocated resources when the PDCCH includes the C-RNTI forpersistent scheduling and the resource allocation information has beenset to the predetermined value.
 2. A mobile station apparatus adapted tosearch for a physical downlink control channel (PDCCH) transmitted by abase station apparatus in a search space, the search space comprising aplurality of resource elements, the search space corresponding to acell-radio network temporary identity (C-RNTI) for dynamic scheduling,the mobile station apparatus comprising: a decoding unit configured tosearch for the PDCCH in the search space, the search space being locatedby the mobile station apparatus according to the C-RNTI for dynamicscheduling, and to decode the PDCCH according to a C-RNTI for persistentscheduling, wherein the PDCCH includes both the C-RNTI for persistentscheduling and resource allocation information; and a scheduling unitconfigured to halt transmission on persistently-allocated resources whenthe PDCCH includes the C-RNTI for persistent scheduling and the resourceallocation information has been set to a predetermined value.
 3. Aprocessing method in a mobile station apparatus which searches for aphysical downlink control channel (PDCCH) transmitted by a base stationapparatus in a search space, the search space comprising a plurality ofresource elements, the search space corresponding to a cell-radionetwork temporary identity (C-RNTI) for dynamic scheduling, theprocessing method comprising: searching for the PDCCH in the searchspace, the search space being located by the mobile station apparatusaccording to the C-RNTI for dynamic scheduling; decoding the PDCCHaccording to a C-RNTI for persistent scheduling when the mobile stationapparatus has both the C-RNTI for dynamic scheduling and the C-RNTI forpersistent scheduling, wherein the PDCCH includes both the C-RNTI forpersistent scheduling and resource allocation information; and haltingdata transmission on persistently-allocated resources when the PDCCHincludes the C-RNTI for persistent scheduling and the resourceallocation information has been set to a predetermined value.
 4. A basestation apparatus adapted to transmit, to a mobile station apparatus, aphysical downlink control channel (PDCCH) in a search space, the searchspace comprising a plurality of resource elements, the search spacecorresponding to a cell-radio network temporary identity (C-RNTI) fordynamic scheduling, the base station apparatus comprising: a schedulingunit; and a transmitting unit configured to transmit, to the mobilestation apparatus, the PDCCH in the search space, wherein the PDCCHincludes both a C-RNTI for persistent scheduling and resource allocationinformation set to a predetermined value when a mobile station apparatushas both the C-RNTI for dynamic scheduling and the C-RNTI for persistentscheduling, wherein the PDCCH is designated to be searched in the searchspace, the search space being located by the mobile station apparatusaccording to the C-RNTI for dynamic scheduling, and wherein the PDCCH isfurther designated to be decoded by the mobile station apparatusaccording to the C-RNTI for persistent scheduling, and wherein thepredetermined value of the resource allocation information is designatedto direct the mobile station apparatus to halt data transmission onpersistently-allocated resources.
 5. A method comprising: searching, bya mobile station, for a physical downlink control channel (PDCCH) in asearch space, the search space being located by the mobile stationapparatus according to a cell-radio network temporary identity (C-RNTI)for dynamic scheduling, the search space comprising a plurality ofresource elements, and the PDCCH including both a C-RNTI for persistentscheduling and resource allocation information set to a predeterminedvalue; decoding, by the mobile station, the PDCCH according to theC-RNTI for persistent scheduling; and halting, by the mobile station,data transmission on persistently-allocated resources when the PDCCHincludes the C-RNTI for persistent scheduling and the resourceallocation information has been set to the predetermined value.
 6. Themethod according to claim 5, wherein the search space includes aplurality of candidate positions for placement of the PDCCH.
 7. A mobilestation, comprising at least one processor and a memory coupled to theprocessor, wherein the processor is configured to: search for a physicaldownlink control channel (PDCCH) in a search space, the search spacebeing located by the mobile station apparatus according to a cell-radionetwork temporary identity (C-RNTI) for dynamic scheduling, the PDCCHbeing transmitted by a base station in the search space, the searchspace comprising a plurality of resource elements, and the PDCCHincluding both a C-RNTI for persistent scheduling and resourceallocation information, decode the PDCCH according to the C-RNTI forpersistent scheduling; and halt data transmission onpersistently-allocated resources when the PDCCH includes the C-RNTI forpersistent scheduling and the resource allocation information has beenset to a predetermined value.
 8. The mobile station according to claim7, wherein the search space includes a plurality of candidate positionsfor placement of the PDCCH.
 9. A method of instructing datatransmission, comprising: setting a cell-radio network temporaryidentity (C-RNTI) for dynamic scheduling; setting a C-RNTI forpersistent scheduling; setting resource allocation information to apredetermined value; and transmitting a physical downlink controlchannel (PDCCH) in a search space, the search space comprising aplurality of resource elements, and the PDCCH including both the C-RNTIfor persistent scheduling and the resource allocation information,wherein the PDCCH is designated to be searched in the search space, thesearch space being located by a mobile station according to the C-RNTIfor dynamic scheduling and to be decoded by the mobile station accordingto the C-RNTI for persistent scheduling, and the predetermined value ofthe resource allocation information is designated to direct the mobilestation to halt data transmission on persistently-allocated resources.10. The method according to claim 9, wherein the search space includes aplurality of candidate positions for placement of the PDCCH.
 11. A basestation, comprising at least one processor and a memory coupled to theprocessor, wherein the processor is configured to: set a cell-radionetwork temporary identity (C-RNTI) for dynamic scheduling; set a C-RNTIfor persistent scheduling; set resource allocation information to apredetermined value; and transmit a physical downlink control channel(PDCCH) in a search space, the search space comprising a plurality ofresource elements, and the PDCCH including both the C-RNTI forpersistent scheduling and the resource allocation information, whereinthe PDCCH is designated to be searched in the search space, the searchspace being located by a mobile station according to the C-RNTI fordynamic scheduling and to be decoded by the mobile station according tothe C-RNTI for persistent scheduling, and wherein the predeterminedvalue of the resource allocation information is designated to direct themobile station to halt data transmission on persistently-allocatedresources.
 12. The base station according to claim 11, wherein thesearch space includes a plurality of candidate positions for placementof the PDCCH.